Trane SCWH - Manual (Page 28)

28 PKG-SVX14A-EN
control disarming rearming
high pressure control (air-cooled & 12-ton water cooled) 624±17.5 psig 464±29 psig
high pressure control (water-cooled except 12-ton) 450±10 psig 348±14.5 psig
low pressure contol 51±7 psig 94±7 psig
266±5F 194±5 3 / 204-230 & 575
275±5F 198 5 / 208-230
266±5F 198 5 / 575
194±5 F 135 7.5 - 10 / 208-230
248±5F 156 7.5 - 10 / 575
194±5F 135 12 - 15 / 208-230
221±5F 142 12 - 15 / 575
motor windings thermostat, standard motor only
unit (ton / voltage)
Maintenance
maintenance
procedures
water-cooled air-cooled
high pressure 280 to 430 psig 320 to 570 psig
low pressure
superheat
subcooling 100 to 160 psig
4 to 9°F
5 to 10°F
Table M-MP-2. Controls adjustment
Table M-MP-1. Normal operation condition
CAUTION
Motor Winding Damage!
Do not use a megohm meter or apply
greater than 50 VDC to a compressor
motor winding while it is under a
deep vacuum. Voltage sparkover may
cause damage to the motor windings.
WARNING
Hazardous Pressures!
If a heat source is required to raise
the tank pressure during removal of
refrigerant from cylinders, use only
warm water or heat blankets to raise
the tank temperature. Do not exceed
a temperature of 150°F. Do not, under
any circumstances, apply direct flame
to any portion of the cylinder. Failure
to follow these safety precautions
could result in a violent explosion,
which could result in death or serious
injury.
Charging the Refrigerant System
To completely charge the system, charge
gaseous refrigerant into the suction line
shrader valve with the unit running.
However, make sure that some
refrigerant is present in each circuit
before starting the compressors.
CAUTION
Compressor Damage!
Do not allow liquid refrigerant to enter
the suction line. Excessive liquid
accumulation in the liquid lines may
result in compressor damage.
CAUTION
Compressor Damage!
Never manually or automatically
pump down below 7 psig. This may
cause the compressor to operate in a
vacuum and result in compresor
damage.